ILLUSTRATIONS 



Figure Page 



1. Portion of Florida west coast in which experimental control 



of red tide was attempted during September and October of 



1957 41 



2. Areas dusted with copper sulfate showing the dates and the 



tonnages used (see table 1) 42 



3. Survey of red tide occurrence on September 26, 1957 



4. Survey of red tide ocrii»-- — 



- «^x Little Pass . . 56 



^_-... dtoms of copper per liter off John's Pass and 

 number of red tide organisms per liter. Empirical curve 

 shows that number of organisms was reduced at higher 

 levels of copper 56 



20. Surface water samples from off Blind Pass showing the num- 

 ber of red tide organisms and copper concentrations per 

 liter. The before and after dusting points for the G. 

 breve curve on September 29 show the swift destruction of 

 G. breve when the copper concentration rose 57 



